fix caching so that there is the ability to download services without installing them.  This is done with a #NOPRIME comment in apts/files/
diff --git a/files/apts/swift b/files/apts/swift
index c52c68b..f298377 100644
--- a/files/apts/swift
+++ b/files/apts/swift
@@ -1,6 +1,6 @@
 curl
 gcc
-memcached
+memcached # NOPRIME
 python-configobj
 python-coverage
 python-dev